CN115749582A

CN115749582A - Down-the-hole hammer drilling tool with rectangular hole forming

Info

Publication number: CN115749582A
Application number: CN202211586063.0A
Authority: CN
Inventors: 郝朝旭; 郭振宇; 黄邦杰; 陆杰; 陈明星
Original assignee: China Coal Geology Group Co Ltd
Current assignee: China Coal Geology Group Co Ltd
Priority date: 2022-12-06
Filing date: 2022-12-06
Publication date: 2023-03-07

Abstract

The utility model relates to a down-the-hole hammer drilling tool of rectangle pore-forming belongs to geology drilling equipment's field, and it includes drilling rod, impact tup and actuating mechanism, the drilling rod is located the one end and the two relative slip of drilling rod, and the slip direction does the length direction of drilling rod, actuating mechanism is used for controlling the removal of drilling rod and the removal of the relative drilling rod of pushing head, impact one side and soil layer or the stratum butt that the tup deviates from the drilling rod, the impact area of impact tup to soil layer or stratum is the rectangle in the ascending projection of drilling rod moving direction. This application adopts the mode of boring into the rectangular hole in succession at the in-process of underground continuous wall grooving construction for remain the tooth limit structure on the cell wall of underground continuous wall grooving almost, also saved solitary tooth limit clearance preface, improved the efficiency of construction and saved construction cost.

Description

Down-the-hole hammer drilling tool with rectangular hole forming

Technical Field

The application relates to the field of geological drilling equipment, in particular to a down-the-hole hammer drilling tool for rectangular hole forming.

Background

As an enclosure structure capable of stopping water and bearing, the underground diaphragm wall is increasingly widely applied along with the increase of deep foundation pit engineering. The underground diaphragm wall can improve the safety of underground engineering, can greatly save construction cost, shorten construction period and prevent surrounding foundations from sinking, and is a deep foundation pit supporting technology with development prospect and popularization value.

When the underground diaphragm wall grooving construction meets a deep rock stratum, a rotary drilling rig is generally adopted to rotate to take a core for pore forming, a percussion drilling square hammer is used for percussion hole repairing, finally, a grab bucket is used for clearing the groove, so that the cross section of the final pore forming reaches the design requirement and is rectangular, and the underground diaphragm wall reinforcement cage is convenient to transfer and diaphragm wall concrete is tamped to form the wall construction. The specific operation process is shown in fig. 1: the first step is as follows: sequentially drilling a plurality of first sequence holes by a rotary drilling rig or a down-the-hole hammer drilling rig; the second step is that: sequentially drilling a plurality of second sequence holes by a rotary drilling rig or a down-the-hole hammer drilling rig, wherein the arrangement directions of the first sequence holes and the second sequence holes are both the length direction of the continuous wall; the third step: and (4) punching the residual tooth edge to repair the hole and form a groove by using a punching pile machine or a hydraulic grab bucket.

With respect to the related art in the above, the inventors consider that: the construction process needs cross-fit construction of various construction equipment, and is complex in flow, slow in progress and high in cost.

Disclosure of Invention

In order to improve the above problems, the present application provides a down-the-hole hammer drill for rectangular hole formation.

The application provides a down-the-hole hammer drilling tool of rectangle pore-forming adopts following technical scheme:

the utility model provides a down-the-hole hammer drilling tool of rectangle pore-forming, includes drilling rod, strikes tup and actuating mechanism, the drilling rod is located the one end and the two relative slip of drilling rod, and the slip direction does the length direction of drilling rod, actuating mechanism is used for controlling the removal of drilling rod and the removal of the relative drilling rod of pushing head, strike one side and soil layer or the stratum butt that the tup deviates from the drilling rod, the impact area of percussion hammer to soil layer or stratum is the rectangle in the ascending projection of drilling rod moving direction.

By adopting the technical scheme, the projection of the impact area of the impact hammer head on the soil layer or the rock stratum in the moving direction of the drill rod is rectangular, and holes with rectangular sections can be punched and drilled underground in the operation process of the drilling tool, so that when the drilling tool is carried by the drilling machine to directionally move along the length direction of the diaphragm wall and drill holes in sequence, obvious residual tooth edges can hardly be left on the integrally formed groove wall of the diaphragm wall, additional working procedures for cleaning the residual tooth edges are not needed, the flow steps are saved, and the construction efficiency is improved.

Preferably, the drilling machine further comprises a base frame, one end of the base frame, which faces the ground bottom, is fixedly connected with a guide frame, the outline of the inner edge of the guide frame is square, the cross sections of the drill rod and the impact hammer head are in a shape of a reuleaux triangle, the drill rod comprises a guide rotor, the guide rotor is positioned at one end far away from the impact hammer head, the radius of an edge arc line of the cross section of the guide rotor is equal to the side length of the outline of the inner edge of the guide frame, and the side wall of the guide rotor is abutted against the side wall of the inner edge of the guide frame; the driving mechanism comprises a driving motor and a universal coupling, the driving motor is fixedly connected with the base frame, one end of the universal coupling is connected with an output shaft of the driving motor, and the other end of the universal coupling is connected with the central point of the guide rotor.

By adopting the technical scheme, the drill rod rotates under the action of the driving mechanism, meanwhile, the guide rotor with the cross section of the Lelo triangle is guided by the guide frame, the area with the square cross section is swept out in the rotating process, and the area which can be finally acted by the impact hammer head is square in shape, namely, the drilling tool can form the hole with the square cross section.

Preferably, the driving mechanism comprises a power-assisted air pipe, one end of the power-assisted air pipe is connected with the air source, the other end of the power-assisted air pipe is fixedly connected with the guide frame, a pipe orifice of the end of the power-assisted air pipe is positioned on the inner side wall of the guide frame, and in the projection along the length direction of the drill rod, the direction of the pipe orifice of the power-assisted air pipe, which faces the inner side of the guide frame, is the same as the direction of the output shaft of the driving motor in a rotating mode.

Preferably, a power airflow channel is formed in the drill rod, a containing cavity is formed in one end, facing the impact hammer, of the drill rod, one side, deviating from the ground bottom, of the impact hammer extends into the containing cavity, one end of the power airflow channel is communicated with the containing cavity, a port, far away from the containing cavity, of one end of the power airflow channel is located in the guide frame, an air guide pipe and a vibrator piston are arranged in the containing cavity, the air guide pipe is fixedly connected with the inner wall of the containing cavity and communicated with the power airflow channel and the containing cavity simultaneously, the vibrator piston is located in the containing cavity to slide, a pressure relief hole is formed in the impact hammer head, one end of the pressure relief hole is located on one side, facing the ground bottom, of the impact hammer, and the other end of the pressure relief hole is communicated with the containing cavity.

By adopting the technical scheme, the airflow generated by the air source finally enters the accommodating cavity to vibrate and drive the vibrator piston, so that the drilling tool runs normally, the down-the-hole hammer works, and meanwhile, the airflow entering the guide frame forms pressure in the cavity between the guide rotor and the inner wall of the guide frame, so that certain auxiliary power is provided for the continuous rotation of the guide rotor.

Preferably, three ports of the power airflow channel in the guide frame are arranged and are respectively located on three side walls of the guide rotor, and one-way valves are arranged on the guide rotor and in the power airflow channel.

Through adopting above-mentioned technical scheme, because the direction rotor of a plurality of helping hand trachea in the rotation produces the helping hand atmospheric pressure of equidirectional, so all set up the hole that supplies the air current to let out on every lateral wall of direction rotor and can keep the relative stress balance of direction rotor, the setting of check valve improves the stability of the whole flow direction of air current.

Preferably, the check valve includes mount pad, extension spring and activity ball that resets, the mount pad can be dismantled and connect on the direction rotor and be located the port department of power air runner, the one end and the mount pad of extension spring that resets are connected, and the other end is connected with the activity ball, the activity ball is located the power air runner.

Preferably, the one end fixedly connected with a plurality of stereoplasm buttons that the impact tup is towards the ground end, the stereoplasm button has been seted up and has been blown husky hole, blow husky hole and pressure release hole intercommunication.

Through adopting above-mentioned technical scheme, at the in-process of drilling tool work, the power air current is in proper order from the pressure release hole of assaulting the tup and the blowing sand hole blowout of stereoplasm ball tooth, assaults the soil property of assaulting the tup below, blows off the hack and the hack sand that lie in stereoplasm ball tooth below on the diapire in the hole to make stereoplasm ball tooth more directly with the stereoplasm structure butt striking in the soil layer.

Preferably, the drilling rod is still including sweeping soil portion and holding portion, the holding cavity is located the holding portion, sweep soil portion and be located between direction rotor and the holding portion, the cross-sectional projection of sweeping soil portion is less than the cross-sectional projection of holding portion, sweep a plurality of soil teeth of sweeping of fixedly connected with on the lateral wall of soil portion, it is adjacent sweep and be formed with the clearance between the soil tooth, edge in the ascending projection of drilling rod length direction, the tip of sweeping the soil tooth is located the edge of holding portion.

By adopting the technical scheme, in the process that the drilling tool is driven to rotate continuously, the soil sweeping teeth can be used for shifting the broken soil or gravels falling from the inner wall of the hole to the adjacent groove forming space of the underground diaphragm wall after drilling is finished, so that the influence of the impurities on the equipment in the current drilling process is reduced.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the projection of the impact hammer head on the soil layer or rock stratum in the moving direction of the drill rod is rectangular, and holes with rectangular sections can be punched and drilled underground in the operation process of the drilling tool, so that the drilling tool can be carried by the drilling tool to directionally move along the length direction of the continuous wall and sequentially drill holes without reversely moving for cleaning residual tooth edges, the flow steps are saved, and the construction efficiency is improved;

2. through the arrangement of the power-assisted air pipe and the power air flow channel, air flow generated by an air source finally enters the accommodating cavity to vibrate and drive the vibrator piston, so that the drilling tool runs normally, the down-the-hole hammer works, meanwhile, the air flow entering the guide frame forms pressure in the cavity between the guide rotor and the inner wall of the guide frame, and certain auxiliary power is provided for continuous rotation of the guide rotor.

Drawings

FIG. 1 is a schematic flow chart for embodying the grooving construction of the underground diaphragm wall in the background of the application.

Fig. 2 is a schematic structural diagram of a down-the-hole hammer drill for embodying rectangular hole formation in the embodiment of the present application.

Fig. 3 is a schematic diagram for embodying a matching structure of a guide frame and a guide drill in an embodiment of the present application.

Fig. 4 is a schematic cross-sectional view for embodying a guide frame and a guide drill matching structure in an embodiment of the present application.

Fig. 5 is a schematic diagram for showing an internal structure of the accommodating portion in the embodiment of the present application.

Description of reference numerals: 1. a base frame; 12. a guide frame; 2. a drill stem; 21. a guide rotor; 22. a soil sweeping part; 221. soil sweeping teeth; 23. an accommodating portion; 231. a receiving cavity; 232. an air duct; 233. a piston of the vibrator; 24. a power gas flow channel; 25. a one-way valve; 251. a mounting seat; 252. a return tension spring; 253. a movable ball; 3. a drive mechanism; 31. a drive motor; 32. a universal coupling; 33. a booster air pipe; 4. impacting a hammer head; 41. a pressure relief vent; 42. hard spherical teeth; 421. and blowing sand holes.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses a rectangular hole-forming down-the-hole hammer drilling tool, as shown in fig. 2, the drilling tool comprises a basic frame 1, a drill rod 2, an impact hammer head 4 and a driving mechanism 3, wherein the impact hammer head 4 is positioned at one end of the drill rod 2 and moves relative to the drill rod 2, one side of the impact hammer head 4, which is far away from the drill rod 2, is abutted against a soil layer or a rock stratum of a ground bottom, and the basic frame 1 is positioned at the other end of the drill rod 2; a drive mechanism 3 is located in the base frame 1 for controlling the rotation of the drill rod 2 relative to the base frame 1 and the movement of the striker 4 relative to the drill rod 2.

As shown in fig. 2, 3 and 4, the projections of the drill rod 2 and the impact hammer head 4 in the length direction of the drill rod 2 are in a shape of a reuleaux triangle, the guide frame 12 is integrally formed on one side of the foundation frame 1 facing the ground bottom, the drill rod 2 sequentially comprises a guide rotor 21, a soil sweeping part 22 and an accommodating part 23 from top to bottom, the guide rotor 21, the soil sweeping part 22 and the accommodating part 23 are sequentially and coaxially and fixedly connected, the impact hammer head 4 is located at the accommodating part 23, and the guide rotor 21 is located in the guide frame 12. The projections of the outer edge contour and the inner edge contour of the guide frame 12 in the length direction of the drill rod 2 are both square, in the projection in the direction, the edge arc radius of the cross section towards the rotor is equal to the side length of the inner edge contour of the guide frame 12, and the side wall of the guide rotor 21 is abutted against the side wall of the inner edge of the guide frame 12. The driving mechanism 3 comprises a driving motor 31 and a universal coupling 32, the driving motor 31 is fixedly connected with the base frame 1, the axial direction of an output shaft of the driving motor 31 is consistent with the length direction of the drill rod 2, and the projection of the output shaft in the axial direction is positioned at the centroid of the guide frame 12. One end of the universal coupling 32 is coaxially fixed with the output shaft of the driving motor 31, and the other end is fixed at the centroid of one side of the guide rotor 21, which deviates from the ground bottom; therefore, in the process of starting the driving motor 31, the output shaft of the driving motor rotates along with the guiding rotor 21 through the universal coupling 32 to the guiding rotor 21, the side wall of the guiding rotor 21 abuts against and rolls along the side wall of the inner edge of the guiding frame 12, and finally the drilling rod 2 and the impact hammer 4 sweep out a square cross section in the vertical projection.

As shown in fig. 2, 3 and 4, the driving mechanism 3 includes an assist air pipe 33, one end of the assist air pipe 33 is connected to an air source (not shown in the figure), the other end is fixedly connected to the guide frame 12, and the pipe orifice of the end is located on the inner edge side wall of the guide frame 12; the number of the assisted air pipes 33 is four, the port of a single assisted air pipe 33 is located at the edge of one side wall of the guide frame 12, and in the projection along the length direction of the drill rod 2, the direction of the pipe orifice of the assisted air pipe 33 towards the inner side of the guide frame 12 is the same as the direction of the output shaft of the driving motor 31. In the process of the rotation of the guide rotor 21, the air flow sprayed into the guide frame 12 from the booster air pipe 33 can increase the air pressure in the space between the side wall of the guide rotor 21 and the side wall of the inner edge of the guide frame 12, and add auxiliary power to the continuous rotation of the guide rotor 21; in fig. 4, the steering of the guide rotor 21 is counterclockwise.

As shown in fig. 3, 4 and 5, a power flow channel 24 is formed in the drill rod 2, the accommodating portion 23 is formed with an accommodating cavity 231, the upper end of the impact hammer 4 is located in the accommodating cavity 231, the lower end of the impact hammer extends out of the accommodating cavity 231, a port of one end of the power flow channel 24, which is far away from the accommodating cavity 231, is located in the guide frame 12, and three ports of the power flow channel 24, which are located in the guide frame 12, are respectively located on three side walls of the guide rotor 21. In the process of rotating the guide rotor 21, the space between the single side wall of the guide rotor and the inner edge side wall of the guide frame 12 is enlarged and then reduced, the power-assisted air pipe 33 is always ventilated, and continuous air flow enters the drill rod 2 through the power air flow channel 24 and finally reaches the accommodating cavity 231 to play a role as power air flow of the down-the-hole hammer. Therefore, in order to maintain the continuity and stability of the air flow, the one-way valve 25 is arranged on the guide rotor 21 and in the power air flow channel 24, the one-way valve 25 comprises a mounting seat 251, a return tension spring 252 and a movable ball 253, a through hole is formed in the mounting seat 251, one end of the return tension spring 252 is fixedly connected to the hole wall of the through hole, the other end of the return tension spring is connected with the movable ball 253, and in a natural state, the through hole in the mounting seat 251 is blocked by the movable ball 253. The mounting seat 251 is cylindrical and is formed with an external thread structure, and is mounted on the guide rotor 21 through a threaded connection, and the movable ball 253 is located in the power flow channel 24.

As shown in fig. 5, an air duct 232 is fixedly connected in the accommodating cavity 231, one end of the air duct 232 is communicated with the accommodating cavity 231, and the other end is communicated with the power airflow channel 24. The containing cavity is further provided with a vibrator piston 233 in a sliding mode, one end of the vibrator piston 233 is coaxially sleeved outside the air guide tube 232, a channel for air flow to pass through is formed in the vibrator piston 233, the impact hammer 4 is provided with a pressure relief hole 41, and the pressure relief hole 41 is used for enabling power air flow entering the containing cavity to be discharged from the drill rod 2. In this embodiment, the working principle and the matching mechanism of the air duct 232, the piston 233 and the impact hammer head 4 are similar to those of a conventional down-the-hole hammer, and are not described herein again. Strike tup 4 towards a plurality of stereoplasm ball teeth 42 of one end fixedly connected with at the bottom of the earth, it blows husky hole 421 to have seted up on the stereoplasm ball tooth 42, blow husky empty and the pressure release hole 41 direct intercommunication of striking tup 4, at the in-process of drilling tool work, the power air current is in proper order from the pressure release hole 41 of striking tup 4 and the blowing sand hole 421 blowout of stereoplasm ball tooth 42, strike the soil property of striking tup 4 below, the hack and the hack that lie in stereoplasm ball tooth 42 below on the diapire in the hole blow away, so that stereoplasm ball tooth 42 is direct ground more and the stereoplasm structure butt striking in the soil layer.

As shown in fig. 2, the cross-sectional projection of the soil-sweeping part 22 is smaller than that of the accommodating part 23, soil-sweeping teeth 221 are integrally formed on the side wall of the soil-sweeping part 22 at each edge, in the projection along the length direction of the drill rod 2, the end parts of the soil-sweeping teeth 221 are located at the edge of the accommodating part 23, and a gap is formed between every two adjacent soil-sweeping teeth 221. In the process of continuous downward drilling of the drilling tool, soil or rock stratum structures on the inner wall of the hole can continuously generate falling soil or slight collapse due to factors such as vibration and the like, namely, broken soil, broken stones and the like are continuously fallen from the inner wall of the hole. In the process that the drilling tool is driven to rotate continuously, the soil sweeping teeth 221 can shift the broken soil or gravels falling from the inner wall of the hole into the adjacent groove forming space of the underground diaphragm wall after drilling is completed, and the influence of the impurities on the equipment in the current drilling process is reduced.

The implementation principle of the down-the-hole hammer drilling tool for rectangular hole forming is as follows:

in the underground wall grooving process, the drilling tool adopting the scheme is used for drilling, and the cross section of the hole formed by the drilling tool is square, so that in the directional and sequential drilling process, obvious residual tooth edges can not be left on the integrally formed groove wall of the underground continuous wall grooving, and an additional flow of cross repair is not needed.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a down-the-hole hammer drilling tool of rectangle pore-forming, includes drilling rod (2), strikes tup (4) and actuating mechanism (3), drilling rod (2) are located the one end and the two relative slip of drilling rod (2), and the slip direction is the length direction of drilling rod (2), actuating mechanism (3) are used for controlling the removal of drilling rod (2) and the removal of the relative drilling rod (2) of tool bit that pushes away, strike one side and soil layer or the stratum butt that tup (4) deviate from drilling rod (2), its characterized in that: the projection of the impact area of the impact hammer head (4) on the soil layer or the rock stratum in the moving direction of the drill rod (2) is rectangular.

2. A down-the-hole hammer drill for rectangular hole formation according to claim 1, wherein: the drilling machine is characterized by further comprising a base frame (1), one end, facing the ground bottom, of the base frame (1) is fixedly connected with a guide frame (12), the outline of the inner edge of the guide frame (12) is square, the cross sections of the drill rod (2) and the impact hammer head (4) are in a shape of a Reuleaux triangle, the drill rod (2) comprises a guide rotor (21), the guide rotor (21) is located at one end far away from the impact hammer head (4), the edge arc radius of the cross section of the guide rotor (21) is equal to the side length of the outline of the inner edge of the guide frame (12), and the side wall of the guide rotor (21) is abutted to the side wall of the inner edge of the guide frame (12);

actuating mechanism (3) are including driving motor (31) and universal joint (32), driving motor (31) and basic frame (1) fixed connection, the one end of universal joint (32) and the output shaft of driving motor (31), the other end is connected with the central point of direction rotor (21).

3. A down-the-hole hammer drill for rectangular hole formation according to claim 2, wherein: the driving mechanism (3) comprises an assisting air pipe (33), one end of the assisting air pipe (33) is connected with an air source, the other end of the assisting air pipe is fixedly connected with the guide frame (12), a pipe orifice of the end is positioned on the inner side wall of the guide frame (12), and in the projection along the length direction of the drill rod (2), the direction of a pipe orifice of the assisting air pipe (33) facing the inner side of the guide frame (12) is the same as the direction of the output shaft of the driving motor (31).

4. A down-the-hole hammer drill for rectangular hole formation according to claim 3, wherein: the improved pneumatic hammer is characterized in that a power airflow channel (24) is formed in the drill rod (2), a containing cavity (231) is formed in one end, facing the impact hammer head (4), of the drill rod (2), one side, facing away from the ground bottom, of the impact hammer head (4) extends into the containing cavity (231), one end of the power airflow channel (24) is communicated with the containing cavity (231), one end port, far away from the containing cavity (231), of the power airflow channel (24) is located in the guide frame (12), an air duct (232) and a vibrator piston (233) are arranged in the containing cavity (231), the air duct (232) is fixedly connected with the inner wall of the containing cavity (231) and is communicated with the power airflow channel (24) and the containing cavity (231), the vibrator piston (233) is located in the containing cavity (231) to slide, a pressure relief hole (41) is formed in the impact hammer head (4), one end of the pressure relief hole (41) is located on one side, facing the ground bottom, of the impact hammer head (4), and the other end of the pressure relief hole (41) is communicated with the containing cavity (231).

5. A down-the-hole hammer drill for rectangular hole formation according to claim 4, wherein: three ports of the power airflow channel (24) in the guide frame (12) are arranged and are respectively positioned on three side walls of the guide rotor (21), and one-way valves (25) are arranged on the guide rotor (21) and are positioned in the power airflow channel (24).

6. A down-the-hole hammer drill for rectangular hole formation according to claim 5, wherein: the check valve (25) comprises a mounting seat (251), a reset tension spring (252) and a movable ball (253), the mounting seat (251) is detachably connected to the guide rotor (21) and is located at a port of the power flow channel (24), one end of the reset tension spring (252) is connected with the mounting seat (251), the other end of the reset tension spring is connected with the movable ball (253), and the movable ball (253) is located in the power flow channel (24).

7. A down-the-hole hammer drill for rectangular hole formation according to claim 4, wherein: the one end fixedly connected with a plurality of stereoplasm buttons (42) towards the ground bottom of impact tup (4), sand blowing hole (421) have been seted up on stereoplasm button (42), sand blowing hole (421) and pressure release hole (41) intercommunication.

8. A down-the-hole hammer drill for rectangular hole formation according to claim 4, wherein: drilling rod (2) still include sweep soil portion (22) and portion of holding (23), hold cavity (231) and be located portion of holding (23), sweep soil portion (22) and be located between direction rotor (21) and the portion of holding (23), the cross-sectional projection of sweeping soil portion (22) is less than the cross-sectional projection of portion of holding (23), sweep on the lateral wall of soil portion (22) fixedly connected with a plurality of soil teeth (221) of sweeping, it is adjacent sweep and be formed with the clearance between soil tooth (221), follow in the projection on drilling rod (2) length direction, the tip of sweeping soil tooth (221) is located the edge of portion of holding (23).